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I thought Ohms Law was e=ir, which was taught in the electronics class in the service. recent reading from 'Ask Dr. SETI indicates that Ohms' Law now is Z=e/i.. is this if strictly applied to electronic emanations passing through space. I will not be able to follow complex formulae..

Z (impedance) is the generalized form of r (resistance), otherwise it's the same equation. Z is not just used for waves traveling through space though -- it's a property of any electrical device.

The math gets slightly harder, but it's conceptually simpler -- resistors, capacitors, and inductors all become the same sort of "thing", just with different equations describing their impedances. Explained pretty well here:

This refers only to AC and is often mentioned with a phase angle of lead or lag.

Z is a combination term incorporating all the factors of resistors, capacitors and inductors.

This was written without looking up anything so feel free to correct any of the above.

As far as 8Ω speakers go, the impedance of any speaker is dependent on the frequency driving it. Typically, the "resistance" of a speaker is very high at low frequencies and goes down quickly to an almost shorted condition at higher frequencies.

This refers only to AC and is often mentioned with a phase angle of lead or lag.

Z is a combination term incorporating all the factors of resistors, capacitors and inductors.

This was written without looking up anything so feel free to correct any of the above.

As far as 8Ω speakers go, the impedance of any speaker is dependent on the frequency driving it. Typically, the "resistance" of a speaker is very high at low frequencies and goes down quickly to an almost shorted condition at higher frequencies.

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